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Russia has lost access to CERN in a sign that its war in Ukraine is causing a major scientific brain drain

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CERN is about to revoke access to around 500 Russian scientists affiliated with Russian institutions.

The move is a major break for CERN , which is home to the world's only Large Hadron Collider.

Russia is not a CERN member state, but has held observer status since the height of the Cold War .

Around 90 Russian researchers who have worked with CERN have found new jobs at international institutions since 2022 , Nature reported.

CERN has also taken on the cost of covering Russia 's contribution to the site's next major upgrade, the High-Luminosity Large Hadron Collider, which is set to come online in 2029 .